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  Subjects -> COMPUTER SCIENCE (Total: 2053 journals)
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COMPUTER SCIENCE (1198 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 20)
Abakós     Open Access   (Followers: 4)
ACM Computing Surveys     Hybrid Journal   (Followers: 27)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 8)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 11)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 5)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 12)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 14)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 5)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 3)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 7)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 7)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 8)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 28)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Advanced Engineering Materials     Hybrid Journal   (Followers: 28)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 7)
Advances in Artificial Intelligence     Open Access   (Followers: 15)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19)
Advances in Computer Science : an International Journal     Open Access   (Followers: 15)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 51)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
Advances in Materials Sciences     Open Access   (Followers: 14)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 6)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 5)
Advances in Technology Innovation     Open Access   (Followers: 5)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 8)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
AI EDAM     Hybrid Journal  
Air, Soil & Water Research     Open Access   (Followers: 11)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 5)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 5)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annual Reviews in Control     Hybrid Journal   (Followers: 6)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 1)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 12)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Computer Systems     Open Access   (Followers: 2)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 33)
Applied Medical Informatics     Open Access   (Followers: 10)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Applied System Innovation     Open Access  
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 140)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 7)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 7)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access   (Followers: 1)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 4)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 11)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Big Data and Cognitive Computing     Open Access   (Followers: 2)
Biodiversity Information Science and Standards     Open Access  
Bioinformatics     Hybrid Journal   (Followers: 288)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 45)
British Journal of Educational Technology     Hybrid Journal   (Followers: 146)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Capturing Intelligence     Full-text available via subscription  
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cell Communication and Signaling     Open Access   (Followers: 2)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 15)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 21)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 52)
Communications of the Association for Information Systems     Open Access   (Followers: 16)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 9)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 14)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 30)
Computer     Full-text available via subscription   (Followers: 94)
Computer Aided Surgery     Hybrid Journal   (Followers: 6)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Communications     Hybrid Journal   (Followers: 16)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 9)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 23)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 12)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 2)
Computer Music Journal     Hybrid Journal   (Followers: 19)

        1 2 3 4 5 6 | Last

Journal Cover Chinese Journal of Catalysis
  [SJR: 0.6]   [H-I: 29]   [2 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 1872-2067
   Published by Elsevier Homepage  [3175 journals]
  • Recent advances on controllable and selective catalytic oxidation of
           cyclohexene
    • Authors: Hongen Cao; Boran Zhu; Yufan Yang; Lin Xu; Lei Yu; Qing Xu
      Pages: 899 - 907
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Hongen Cao, Boran Zhu, Yufan Yang, Lin Xu, Lei Yu, Qing Xu
      Because of multiple potential reaction sites and variable oxidation depths, oxidation of cyclohexene can lead to a mixture of products with different oxidation states and functional groups, such as 7-oxabicyclo[4.1.0]heptane, trans/cis-cyclohexane-1,2-diol, cyclohex-2-en-1-ol, cyclohex-2-en-1-one, and even adipic acid. These products are broadly and abundantly used intermediates in the chemical industry; therefore, controllable oxidation reactions for cyclohexene that can selectively afford the targeted products are synthetically valuable for applications in both the academy and industry, thus becoming the aim of synthetic and catalytic chemists in the field. Many reports on selective oxidation of cyclohexene have recently appeared in the literature because of its significance. This short review summarizes the recent advances on this subject, and the contents are mainly classified based on the chosen oxidants. We hope that this review can provide a useful guide for controllable and selective catalytic oxidation of cyclohexene for interested readers from both the academy and industry.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63050-5
       
  • A viewpoint on catalytic origin of boron nitride in oxidative
           dehydrogenation of light alkanes
    • Authors: Lei Shi; Dongqi Wang; An-Hui Lu
      Pages: 908 - 913
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Lei Shi, Dongqi Wang, An-Hui Lu
      Oxidative dehydrogenation of light alkanes to alkenes is an attractive alternative route for industrial direct dehydrogenation because of favorable thermodynamic and kinetic characteristics, but encounters difficulties in selectivity control for alkenes because of over-oxidation reactions that produce a substantial amount of undesired carbon oxides. Recent progress has revealed that boron nitride is a highly promising catalyst in the oxidative dehydrogenation of light alkanes because of its superior selectivity for and high productivity of light alkenes, negligible formation of CO2, and remarkable catalyst stability. From this viewpoint, recent works on boron nitride in the oxidative dehydrogenations of ethane, propane, butane, and ethylbenzene are reviewed, and the emphasis of this viewpoint is placed on discussing the catalytic origin of boron nitride in oxidative dehydrogenation reactions. After analyzing recent progress in the use of boron nitride for oxidative dehydrogenation reactions and finding much new evidence, we conclude that pure boron nitride is catalytically inert, and an activation period is required under the reaction conditions; this process is accompanied by an oxygen functionalization at the edge of boron nitride; the B-O species themselves have no catalytic activity in C-H cleavage, and the B-OH groups, with the assistance of molecular oxygen, play the key role in triggering the oxidative dehydrogenation of propane; the dissociative adsorption of molecular oxygen is involved in the reaction process; and a straightforward strategy for preparing an active boron nitride catalyst with hydroxyl groups at the edges can efficiently enhance the catalytic efficacy. A new redox reaction cycle based on the B-OH sites is also proposed. Furthermore, as this is a novel catalytic system, there is an urgent need to develop new methods to optimize the catalytic performances, clarify the catalytic function of boron species in the alkane ODH reactions, and disclose the reaction mechanism under realistic reaction conditions.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63060-8
       
  • A highly efficient flower-like cobalt catalyst for electroreduction of
           carbon dioxide
    • Authors: Gang Yang; Zhipeng Yu; Jie Zhang; Zhenxing Liang
      Pages: 914 - 919
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Gang Yang, Zhipeng Yu, Jie Zhang, Zhenxing Liang
      Electrochemical conversion of CO2 into fuel has been regarded as a promising approach to achieve the global carbon cycle. Herein, we report an efficient cobalt catalyst with a unique flower-like morphology synthesized by a green and facile hydrothermal method, in which n-butylamine is used as the capping agent. The resultant catalyst shows superior electrocatalytic activity toward CO2 electroreduction, which is highly selective for generating formate with a Faraday efficiency of 63.4%. Electrochemical analysis reveals that the oxide on the surface is essential for the electrocatalysis of the CO2 reduction reaction. Cyclic voltammograms further suggest that this catalyst is highly active for the oxidation of reduced product, and can thus be seen as a bifunctional catalyst.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63021-9
       
  • Fe-TiO2 and Fe2O3 quantum dots co-loaded on MCM-41 for removing aqueous
           rose bengal by combined adsorption/photocatalysis
    • Authors: Guoqiang Shen; Lun Pan; Zhe Lü; Chongqing Wang; Fazal-e- Aleem; Xiangwen Zhang; Ji-Jun Zou
      Pages: 920 - 928
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Guoqiang Shen, Lun Pan, Zhe Lü, Chongqing Wang, Fazal-e- Aleem, Xiangwen Zhang, Ji-Jun Zou
      Adsorption and photodegradation are promising approaches for removing organic pollutions. In this study, we combined these two processes by co-loading Fe-TiO2 and Fe2O3 quantum dots (QDs) on porous MCM-41, using a simple hydrolysis method. X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy results indicated that Fe-TiO2 QDs are formed at low Fe precursor concentrations, while additional Fe2O3 QDs are formed at higher Fe precursor concentrations. The Fe2O3 and Fe-TiO2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41, respectively. Thus, their combination results in a synergic effect of the adsorption and photodegradation. The highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62976-0
       
  • Effective removal of the protective ligands from Au nanoclusters by
           ambient pressure nonthermal plasma treatment for CO oxidation
    • Authors: Yuan Tan; Hua Liu; Xiao Yan Liu; Aiqin Wang; Changjun Liu; Tao Zhang
      Pages: 929 - 936
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Yuan Tan, Hua Liu, Xiao Yan Liu, Aiqin Wang, Changjun Liu, Tao Zhang
      We used a dielectric barrier discharge (DBD) plasma technique to eliminate the protective ligand of ZnAl-hydrotalcite-supported gold nanoclusters. We used X-ray powder diffraction, ultraviolet-visible spectrophotometry, thermogravimetric analysis, and high angle annular dark-field-scanning transmission electron microscopy characterization to show that the samples pretreated with/without DBD-plasma displayed different performances in CO oxidation. The enhanced activity was obtained on the plasma-treated samples, implying that the protective ligand was effectively removed via the plasma technique. The crystal structure of the plasma-treated samples changed markedly, suggesting that the plasma treatment could not only break the chemical bond between the gold and the protective agent but could also decompose the interlayer ions over the hydrotalcite support. The particle sizes of the gold after DBD-plasma treatment implied that it was a good way to control the size of the gold nanoparticles under mild conditions.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63018-9
       
  • Cloning, overexpression, and characterization of a novel organic
           solvent-tolerant lipase from Paenibacillus pasadenensis CS0611
    • Authors: Jiaxin Gao; Xiaoyang Ou; Pei Xu; Minhua Zong; Wenyong Lou
      Pages: 937 - 945
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Jiaxin Gao, Xiaoyang Ou, Pei Xu, Minhua Zong, Wenyong Lou
      We found a novel lipase gene in the Paenibacillus pasadenensis CS0611 strain. The lipase gene sequence was cloned into the pET-28a expression vector to construct a recombinant lipase protein containing 6 × His tags at the C- and N-termini, respectively. High-level expression of the lipase in E.coli BL21 (DE3) was obtained upon induction with IPTG at 20 °C. The recombinant lipase activity was approximately 1631-fold higher than the wild type. His-tagged recombinant lipase was purified rapidly and efficiently by using Ni-charged affinity chromatography with 63.5% recovery and a purification factor of 10.78. The purified lipase was stable in a broad range of temperatures and pH values, with the optimal temperature and pH being 50 °C and 7.0, respectively. Its activity was stimulated to different degrees in the presence of metal ions such as Ca2+, Mg2+, and some non-ionic surfactants. In addition, the purified lipase was activated by a series of water-miscible organic solvents such as some short carbon chain alcohols and was highly tolerant to some water-immiscible organic solvents.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63033-5
       
  • The role of graphene coating on cordierite-supported Pd monolithic
           catalysts for low-temperature combustion of toluene
    • Authors: Wen Li; Hongqi Ye; Gonggang Liu; Hongchao Ji; Yonghua Zhou; Kai Han
      Pages: 946 - 954
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Wen Li, Hongqi Ye, Gonggang Liu, Hongchao Ji, Yonghua Zhou, Kai Han
      In the present work, a Pd/graphene/cordierite (Pd/Gr/Cor) composite was prepared as a monolithic catalyst for low-temperature combustion of toluene. We mainly focused on understanding the role of graphene coating through investigation of catalytic performance and adsorption behavior of the composite. Compared with the traditional Pd/Cor catalyst without graphene coating, Pd/Gr/Cor catalyst delivered much higher activity and stability for toluene catalytic combustion in both dry and moist conditions. Transmission electron microscopy (TEM) and hydrophobic characterizations indicated that graphene coating can considerably improve the dispersity of Pd nanoparticles and enhance the hydrophobicity of the cordierite support. The adsorption behavior of the above two catalysts, including adsorption isothermal, adsorption kinetics, and adsorption thermodynamics were carefully investigated. The simulation results indicated that a large amount of toluene was adsorbed on graphene surface through relatively weak interaction, whereas only a relatively small amount of toluene was adsorbed on Pd surface with strong affinity. The adsorption thermal calculation indicated that the adsorption of toluene on graphene was a process with reduced entropy, indicating highly-ordered assembly of toluene molecular on graphene. It is the significant concentration and affinity gap between graphene and Pd that ensures a simultaneously and rapid transfer of toluene during the reaction process.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63015-3
       
  • Enhancement of catalytic activity by homo-dispersing S2O82–-Fe2O3
           nanoparticles on SBA-15 through ultrasonic adsorption
    • Authors: Qingyan Chu; Jing Chen; Wenhua Hou; Haoxuan Yu; Ping Wang; Rui Liu; Guangliang Song; Hongjun Zhu; Pingping Zhao
      Pages: 955 - 963
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Qingyan Chu, Jing Chen, Wenhua Hou, Haoxuan Yu, Ping Wang, Rui Liu, Guangliang Song, Hongjun Zhu, Pingping Zhao
      Mesoporous superacids S2O8 2–-Fe2O3/SBA-15 (SFS) with active nanoparticles are prepared by ultrasonic adsorption method. This method is adopted to ensure a homo-dispersed nanoparticle active phase, large specific surface area and many acidic sites. Compared with bulk S2O8 2–-Fe2O3, Brönsted acid catalysts and other reported catalysts, SFS with an Fe2O3 loading of 30% (SFS-30) exhibits an outstanding activity in the probe reaction of alcoholysis of styrene oxide by methanol with 100% yield. Moreover, SFS-30 also shows a more excellent catalytic performance than bulk S2O8 2–-Fe2O3 towards the alcoholysis of other ROHs (R = C2H5-C4H9). Lewis and Brönsted acid sites on the SFS-30 surfaces are confirmed by pyridine adsorbed infrared spectra. The highly efficient catalytic activity of SFS-30 may be attributed to the synergistic effect from the nano-effect of S2O8 2–-Fe2O3 nanoparticles and the mesostructure of SBA-15. Finally, SFS-30 shows a good catalytic reusability, providing an 84.1% yield after seven catalytic cycles.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)63007-9
       
  • Green and efficient epoxidation of methyl oleate over hierarchical TS-1
    • Authors: Yue Wei; Gang Li; Qiang Lü; Chuanying Cheng; Hongchen Guo
      Pages: 964 - 972
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Yue Wei, Gang Li, Qiang Lü, Chuanying Cheng, Hongchen Guo
      The epoxidation of methyl oleate (MO) was conducted in the presence of aqueous H2O2 as the oxidant and hierarchical TS-1 (HTS-1) as the catalyst; the catalyst was synthesized using polyquaternium-6 as the mesopore template. The effects of various parameters, i.e., H2O2/C=C molar ratio, oxidant concentration, amount of the catalyst, reaction temperature, and time, were systematically studied. Furthermore, response surface methodology (RSM) was used to optimize the conditions to maximize the yield of epoxy MO and to evaluate the significance and interplay of the factors affecting the epoxy MO production. The H2O2/C=C molar ratio and catalyst amount were the determining factors for MO epoxidation, wherein the maximum yield of epoxy MO reached 94.9% over HTS-1 under the optimal conditions.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63014-1
       
  • Enhancing the photocatalytic activity and photostability of zinc oxide
           nanorod arrays via graphitic carbon mediation
    • Authors: Xuewei Zhang; Xueliang Zhang; Xin Wang; Lequan Liu; Jinhua Ye; Defa Wang
      Pages: 973 - 981
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Xuewei Zhang, Xueliang Zhang, Xin Wang, Lequan Liu, Jinhua Ye, Defa Wang
      Low optical absorption and photocorrosion are two crucial issues limiting the practical applications of zinc oxide (ZnO)-based photocatalysts. In this paper, we report the fabrication of graphitic-carbon-mediated ZnO nanorod arrays (NRAs) with enhanced photocatalytic activity and photostability for CO2 reduction under visible light irradiation. ZnO NRA/C-x (x = 005, 01, 02, and 03) nanohybrids are prepared by calcining pre-synthesized ZnO NRAs with different amounts of glucose (0.05, 0.1, 0.2, and 0.3 g) as a carbon source via a hydrothermal method. X-ray photoelectron spectroscopy reveals that the obtained ZnO NRA/C-x nanohybrids are imparted with the effects of both carbon doping and carbon coating, as evidenced by the detected C−O−Zn bond and the C−C, C−O and C=O bonds, respectively. While the basic structure of ZnO remains unchanged, the UV-Vis absorption spectra show increased absorbance owing to the carbon doping effect in the ZnO NRA/C-x nanohybrids. The photoluminescence (PL) intensities of ZnO NRA/C-x nanohybrids are lower than that of bare ZnO NRA, indicating that the graphitic carbon layer coated on the surface of the ZnO NRA significantly enhances the charge carrier separation and transport, which in turn enhances the photoelectrochemical property and photocatalytic activity of the ZnO NRA/C-x nanohybrids for CO2 reduction. More importantly, a long-term reaction of photocatalytic CO2 reduction demonstrates that the photostability of ZnO NRA/C-x nanohybrids is significantly increased in comparison with the bare ZnO NRA.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63010-4
       
  • CoNiP/NC polyhedrons derived from cobalt-based zeolitic imidazolate
           frameworks as an active electrocatalyst for oxygen evolution
    • Authors: Jintang Li; Guiqing Du; Xian Cheng; Pingjing Feng; Xuetao Luo
      Pages: 982 - 987
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Jintang Li, Guiqing Du, Xian Cheng, Pingjing Feng, Xuetao Luo
      The oxygen evolution reaction (OER) plays an important role in the development of energy conversation and storage technologies including water splitting and metal-air batteries, where the development of electrocatalysts is paramount. In this study, cobalt-nickel phosphide/N-doped porous carbon polyhedron electrocatalysts (CoNiP/NC) were prepared by a facile two-step carbonization method and subsequent phosphorization calcination in an Ar atmosphere using cobalt-based zeolitic imidazolate frameworks (ZIFs) as precursors. Among the electrocatalysts obtained by controlling the carbonization and phosphorization temperature, the CoNiP/NC700 catalyst, where 700 refers to the calcination temperature (°C), exhibited superior electrocatalytic activity for the OER with an onset overpotential of approximate 220 mV and an overpotential of approximate 300 mV in alkaline solution at a current density of 10 mA/cm2. The CoNi/NC and Co/NC Samples were also tested for comparison and CoNiP/NC exhibited the better electrocatalytic activity at all the temperatures tested. The superior electrocatalytic activity of the phosphorization hybrid material can be attributed to the superior synergistic effect of Co, Ni, P and C due to their strong electron coupling interactions. The interconnected amorphous carbon anchored the active Co compounds to avoid aggregation and maintained conducting channels for electron transfer. The composite electrocatalyst prepared herein is a promising candidate for use in electrocatalytic OERs.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63030-x
       
  • Layered double hydroxide-like Mg3Al1−xFex materials as supports for Ir
           catalysts: Promotional effects of Fe doping in selective hydrogenation of
           cinnamaldehyde
    • Authors: Weiwei Lin; Haiyang Cheng; Xiaoru Li; Chao Zhang; Fengyu Zhao; Masahiko Arai
      Pages: 988 - 996
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Weiwei Lin, Haiyang Cheng, Xiaoru Li, Chao Zhang, Fengyu Zhao, Masahiko Arai
      Supported Ir catalysts were prepared using layered double hydrotalcite-like materials, such as Mg3Al1−x Fe x , containing Fe and Al species in varying amounts as supports. These Ir catalysts were applied for the selective hydrogenation of cinnamaldehyde (CAL). When x was changed from 0 (Ir/Mg3Al) to 1 (Ir/Mg3Fe), the rate of CAL hydrogenation reached a maximum at approximately x = 0.25, while the selectivity to unsaturated alcohol, i.e., cinnamyl alcohol, monotonously increased from 44.9% to 80.3%. Meanwhile, the size of the supported Ir particles did not change significantly with x, remaining at 1.7 ± 0.2 nm, as determined by transmission electron microscopy. The chemical state of Ir and Fe species in the Ir/Mg3Al1−x Fe x catalysts was examined by temperature programmed reduction by H2 and X-ray photoelectron spectroscopy. The surface of the supported Ir particles was also examined through the in-situ diffuse reflectance infrared Fourier-transform of a probe molecule of CO. On the basis of these characterization results, the effects of Fe doping to Mg3Al on the structural and catalytic properties of Ir particles in selective CAL hydrogenation were discussed. The significant factors are the electron transfer from Fe2+ in the Mg3Al1–x Fe x support to the dispersed Ir particles and the surface geometry.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63042-6
       
  • Chiral basket-handle porphyrin-Co complexes for the catalyzed asymmetric
           cycloaddition of CO2 to epoxides
    • Authors: Xiying Fu; Xinyao Jing; Lili Jin; Lilong Zhang; Xiaofeng Zhang; Bin Hu; Huanwang Jing
      Pages: 997 - 1003
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Xiying Fu, Xinyao Jing, Lili Jin, Lilong Zhang, Xiaofeng Zhang, Bin Hu, Huanwang Jing
      The catalytic synthesis of cyclic carbonates via the cycloaddition of CO2 to epoxides is a standard methodology for CO2 fixation. For this purpose, chiral basket-handle porphyrin-Co complexes were devised, prepared, and fully characterized by nuclear magnetic resonance, mass spectrometry, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and specific rotation. The proposed metalloporphyrin catalysts were synthesized with either 1,1′-bi-2-naphthol or L-phenylalanine, which have different chirality, and then applied to the coupling of propylene oxide and CO2 for generating chiral cyclic carbonates with good enantioselectivity under extremely mild conditions in the presence of tetrabutyl ammonium chloride as a co-catalyst. The good enantioselectivity in the cycloaddition reaction is attributed to a synergistic interplay between the chiral porphyrin catalysts and the substrate. The mechanism and enantioselectivity of the asymmetric cycloaddition reaction is discussed.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63023-2
       
  • Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric
           oxide by methane
    • Authors: Jun Yang; Yupeng Chang; Weili Dai; Guangjun Wu; Naijia Guan; Landong Li
      Pages: 1004 - 1011
      Abstract: Publication date: May 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 5
      Author(s): Jun Yang, Yupeng Chang, Weili Dai, Guangjun Wu, Naijia Guan, Landong Li
      Bimetallic Cr-In/H-SSZ-13 zeolites were prepared by wet impregnation and investigated for selective catalytic reduction of nitric oxide by methane (CH4-SCR). Reduction-oxidation treatments led to close contact and interaction between Cr and In species in these zeolites, as revealed by transmission electron microscopy and X-ray photoelectron spectroscopy. Compared to monometallic Cr/H-SSZ-13 and In/H-SSZ-13, the bimetallic catalyst system exhibited dramatically enhanced CH4-SCR performance, i.e., NO conversion greater than 90% and N2 selectivity greater than 99% at 550 °C in the presence of 6% H2O under a high gas hourly space velocity of 75 000/h. The bimetallic Cr-In/H-SSZ-13 showed very good stability in CH4-SCR with no significant activity loss for over 160 h. Catalytic data revealed that CH4 and NO were activated on the In and Cr sites of Cr-In/H-SSZ-13, respectively, both in the presence of O2 during CH4-SCR.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63054-2
       
  • Preface to Special Issue on Environmental and Energy Catalysis
    • Authors: Fan Dong; Jiguang Deng
      First page: 565
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Fan Dong, Jiguang Deng
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63062-1
       
  • Copper-based non-precious metal heterogeneous catalysts for environmental
           remediation
    • Authors: Yarong Fang; Yanbing Guo
      Pages: 566 - 582
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Yarong Fang, Yanbing Guo
      This paper presents a detailed review of copper-based catalysts used in wide-ranging environmental remediation, including gas, liquid and solid phase pollutant elimination. Latest advances in the remarkable catalytic activity of copper-based catalysts, including bulk CuO x , supported CuO x , and solid solution CuO x -X are emphasized. The structure-activity relationships among the crystal structure, morphology, catalyst support, and catalytic performance in specific catalytic reactions for environmental remediation are discussed. Furthermore, current obstacles faced by Cu-based catalysts and potential strategies to address them have been proposed, which may aid the future research and development of highly efficient Cu-based non-precious metal catalysts.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62996-6
       
  • Enhancing oxygen reduction electrocatalysis through tuning crystal
           structure: Influence of intermetallic MPt nanocrystals
    • Authors: Jiashun Liang; Zhengpei Miao; Feng Ma; Ran Pan; Xian Chen; Tanyuan Wang; Huan Xie; Qing Li
      Pages: 583 - 589
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Jiashun Liang, Zhengpei Miao, Feng Ma, Ran Pan, Xian Chen, Tanyuan Wang, Huan Xie, Qing Li
      The slow kinetics of oxygen reduction reaction (ORR) occurring at the cathode of a proton exchange membrane fuel cell require the presence of an electrocatalyst to reduce overpotential. MPt alloy nanocrystals (NCs) have been investigated over the last decade as efficient catalysts for ORR and recent studies have shown that structurally-ordered MPt NCs, i.e., intermetallic NCs (iNCs), are more active and exhibit enhanced stability compared with the corresponding randomly alloyed analogues. This mini-review highlights the recent progress in iNC catalyst development for ORR with emphasis on correlating the synthesis-structure-activity relationship. Perspectives and possible research directions to enhance MPt iNC catalytic performance are also proposed.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62989-9
       
  • I-III-VI chalcogenide semiconductor nanocrystals: Synthesis, properties,
           and applications
    • Authors: Shiqi Li; Xiaosheng Tang; Zhigang Zang; Yao Yao; Zhiqiang Yao; Haizheng Zhong; Bingkun Chen
      Pages: 590 - 605
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Shiqi Li, Xiaosheng Tang, Zhigang Zang, Yao Yao, Zhiqiang Yao, Haizheng Zhong, Bingkun Chen
      Colloidal semiconductor nanocrystals have been proven to be promising candidates for applications in low-cost and high-performance photovoltaics, bioimaging, and photocatalysis due to their novel size- and shape-dependent properties. Among the colloidal systems, I-III-VI semiconductor nanocrystals (NCs) have drawn much attention in the past few decades. Compared to binary NCs, ternary I-III-VI NCs not only exhibit low toxicity, but also a high performance similar to that of binary NCs. In this review, we mainly focus on the synthesis, properties, and applications of I-III-VI NCs. We summarize the major synthesis methods, analyze their photophysical and electronic properties, and highlight some of the latest applications of I-III-VI NCs in solar cells, light-emitting diodes, bioimaging, and photocatalysis. Finally, based on the information reviewed, we highlight the existing problems and challenges.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63052-9
       
  • Fabrication of ultrafine Pd nanoparticles on 3D ordered macroporous TiO2
           for enhanced catalytic activity during diesel soot combustion
    • Authors: Yuechang Wei; Qiangqiang Wu; Jing Xiong; Jian Liu; Zhen Zhao
      Pages: 606 - 612
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Yuechang Wei, Qiangqiang Wu, Jing Xiong, Jian Liu, Zhen Zhao
      Nanocatalysts consisting of three-dimensionally ordered macroporous (3DOM) TiO2-supported ultrafine Pd nanoparticles (Pd/3DOM-TiO2-GBMR) were readily fabricated by gas bubbling-assisted membrane reduction (GBMR) method. These catalysts had a well-defined and highly ordered macroporous nanostructure with an average pore size of 280 nm. In addition, ultrafine hemispherical Pd nanoparticles (NPs) with a mean particle size of 1.1 nm were found to be well dispersed over the surface of the 3DOM-TiO2 support and deposited on the inner walls of the material. The nanostructure of the 3DOM-TiO2 support ensured efficient contact between soot particles and the catalyst. The large interface area between the ultrafine Pd NPs and the TiO2 also increased the density of sites for O2 activation as a result of the strong metal (Pd)-support (TiO2) interaction (SMSI). A Pd/3DOM-TiO2-GBMR catalyst with ultrafine Pd NPs (1.1 nm) exhibited higher catalytic activity during diesel soot combustion compared with that obtained from a specimen having relatively large Pd NPs (5.0 nm). The T 10, T 50 and T 90 values obtained from the former were 295, 370 and 415 °C. Both the activity and nanostructure of the Pd/3DOM-TiO2-GBMR catalyst were stable over five replicate soot oxidation trials. These results suggest that nanocatalysts having a 3DOM structure together with ultrafine Pd NPs can decrease the amount of Pd required, and that this approach has potential practical applications in the catalytic combustion of diesel soot particles.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62939-5
       
  • NiFe layered double-hydroxide nanoparticles for efficiently enhancing
           performance of BiVO4 photoanode in photoelectrochemical water splitting
    • Authors: Qizhao Wang; Tengjiao Niu; Lei Wang; Jingwei Huang; Houde She
      Pages: 613 - 618
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Qizhao Wang, Tengjiao Niu, Lei Wang, Jingwei Huang, Houde She
      A bismuth vanadate (BiVO4) photoanode with a cocatalyst consisting of NiFe layered double-hydroxide (NiFe-LDH) nanoparticles was fabricated for photoelectrochemical (PEC) water splitting. NiFe-LDH nanoparticles, which can improve light-absorption capacities and facilitate efficient hole transfer to the surface, were deposited on the surface of the BiVO4 photoanode by a hydrothermal method. All the samples were characterized using X-ray diffraction, scanning electron microscopy, and diffuse-reflectance spectroscopy. Linear sweep voltammetry and current-time plots were used to investigate the PEC activity. The photocurrent response of NiFe-LDH/BiVO4 at 1.23 V vs the reversible hydrogen electrode was higher than those of Ni(OH)2/BiVO4, Fe(OH)2/BiVO4 and pure BiVO4 electrodes under visible-light illumination. NiFe-LDH/BiVO4 also gave a superior PEC hydrogen evolution performance. Furthermore, the stability of the NiFe-LDH/BiVO4 photoanode was excellent compared with that of the bare BiVO4 photoanode, and offers a novel method for solar-assisted water splitting.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62987-5
       
  • Synergistic photo-thermal catalytic NO purification of MnOx/g-C3N4:
           Enhanced performance and reaction mechanism
    • Authors: Peng Chen; Fan Dong; Maoxi Ran; Jiarui Li
      Pages: 619 - 629
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Peng Chen, Fan Dong, Maoxi Ran, Jiarui Li
      Both MnO x and g-C3N4 have been proved to be active in the catalytic oxidation of NO, and their individual mechanisms for catalytic NO conversion have also been investigated. However, the mechanism of photo-thermal catalysis of the MnO x /g-C3N4 composite remains unresolved. In this paper, MnO x /g-C3N4 catalysts with different molar ratios were synthesized by the precipitation approach at room temperature. The as-prepared catalysts exhibit excellent synergistic photo-thermal catalytic performance towards the purification of NO in air. The MnO x /g-C3N4 catalysts contain MnO x with different valence states on the surface of g-C3N4. The thermal catalytic reaction for NO oxidation on MnO x and the photo-thermal catalytic reaction on 1:5 MnO x /g-C3N4 were investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The results show that light exerted a weak effect on NO oxidation over MnO x , and it exerted a positive synergistic effect on NO conversion over 1:5 MnO x /g-C3N4. A synergistic photo-thermal catalytic cycle of NO oxidation on MnO x /g-C3N4 is proposed. Specifically, photo-generated electrons (e−) are transferred to MnO x and participate in the synergistic photo-thermal reduction cycle (Mn4+ →Mn3+ →Mn2+). The reverse cycle (Mn2+ →Mn3+ →Mn4+) can regenerate the active oxygen vacancy sites and inject electrons into the g-C3N4 hole (h + ). The active oxygen (O−) was generated in the redox cycles among manganese species (Mn4+/Mn3+/Mn2+) and could oxidize the intermediates (NOH and N2O2 −) to final products (NO2 − and NO3 −). This paper can provide insightful guidance for the development of better catalysts for NO x purification.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63029-3
       
  • Effect of pore size in mesoporous MnO2 prepared by KIT-6 aged at different
           temperatures on ethanol catalytic oxidation
    • Authors: Bingyang Bai; Qi Qiao; Yanping Li; Yue Peng; Junhua Li
      Pages: 630 - 638
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Bingyang Bai, Qi Qiao, Yanping Li, Yue Peng, Junhua Li
      KIT-6 mesoporous silica aged at 40, 100, and 150 °C were used as hard templates to prepare different mesoporous MnO2 catalysts, marked as Mn-40, Mn-100, and Mn-150, respectively. The catalytic activities of these catalysts and the effect of pore sizes on ethanol catalytic oxidation were investigated. Mn-40, Mn-100, and Mn-150 have triple, double, and single pore systems, respectively. On decreasing the aging temperature of KIT-6, the pore sizes of KIT-6 decrease and that of mesoporous MnO2 catalysts increase. The pore sizes and catalytic activities increase in the order: Mn-40 >Mn-100 > Mn-150. Mn-40 catalyst has a higher TOF (0.11 s−1 at 120 °C) and the best catalytic activity for ethanol oxidation because of a bigger pore size with three pore systems with maximum distribution at 1.9, 3.4, and 6.6 nm, decrease in symmetry and degree of order, more surface lattice oxygen species, oxygen vacancies resulting from more Mn3+ ions, and better low-temperature reducibility.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63036-0
       
  • Synthesis of TiO2 mesocrystal film with enhanced photocatalytic activity
    • Authors: Lili Ling; Longfei Liu; Yawei Feng; Jian Zhu; Zhenfeng Bian
      Pages: 639 - 645
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Lili Ling, Longfei Liu, Yawei Feng, Jian Zhu, Zhenfeng Bian
      TiO2 mesocrystals can considerably enhance charge separation owing to their oriented superstructures, with fewer internal defects and porous properties providing more active sites. In this work, we prepared TiO2 mesocrystal films by a direct annealing method. The morphology and crystal phase of the film were controlled by adjusting the ratio of NH4F and the calcination temperature. Moreover, we found that Au nanoparticles loaded on a TiO2 mesocrystal film enabled highly efficient visible light photocatalytic properties. The photocatalytic activities were studied by hydrogen generation and photoreduction of Cr(VI). This work represents a considerable advance in the development and application of the TiO2 mesocrystals.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62980-2
       
  • Enhanced visible-light photocatalytic performance of a monolithic tungsten
           oxide/graphene oxide aerogel for nitric oxide oxidation
    • Authors: Li Yang; Yang Liu; Ruiyang Zhang; Wei Li; Pu Li; Xin Wang; Ying Zhou
      Pages: 646 - 653
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Li Yang, Yang Liu, Ruiyang Zhang, Wei Li, Pu Li, Xin Wang, Ying Zhou
      Photocatalysis is considered a promising technique for removal of pollutants from indoor air. However, the low selectivity and limited recyclability of photocatalysts in powder form currently limit their practical application. In this work, we reported the successful preparation of a monolithic tungsten oxide (WO3)/graphene oxide (GO) aerogel photocatalyst through a cost-effective freeze-drying method. GO not only acts as a macroscopic support, but also increases the catalyst surface area from 46 to 57 m2/g, enhances the light absorption in the visible-light region, and raises the separation efficiency of photogenerated electron-hole pairs. The Obtained WO3/GO aerogel exhibited an outstanding visible-light photocatalytic degradation rate of nitric oxide of 51%, which was 3.3 times that of pristine WO3 powder. In addition, the aerogel displayed excellent selectivity, with a generation fraction of toxic nitrogen dioxide of as low as 0.5%. This work presents a facile synthesis route to fabricate a monolithic WO3/GO aerogel photocatalyst with great promise for air purification.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62974-7
       
  • Formation of BiOI/g-C3N4 nanosheet composites with high
           visible-light-driven photocatalytic activity
    • Authors: Hua An; Bo Lin; Chao Xue; Xiaoqing Yan; Yanzhu Dai; JinJia Wei; Guidong Yang
      Pages: 654 - 663
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Hua An, Bo Lin, Chao Xue, Xiaoqing Yan, Yanzhu Dai, JinJia Wei, Guidong Yang
      Constructing binary heterojunctions is an important strategy to improve the photocatalytic performance of graphitic carbon nitride (g-C3N4). In this paper, a novel g-C3N4 nanosheet-based composite was constructed via in situ growth of bismuth oxyiodide (BiOI) nanoplates on the surface of g-C3N4 nanosheets. The crystal phase, microstructure, optical absorption and textural properties of the synthesized photocatalysts were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption isotherm measurements. The BiOI/g-C3N4 nanosheet composite showed high activity and recyclability for the photodegradation of the target pollutant rhodamine B (RhB). The conversion of RhB (20 mg L−1) by the photocatalyst was nearly 100% after 50 min under visible-light irradiation. The high photoactivity of the BiOI/g-C3N4 nanosheet composite can be attributed to the enhanced visible-light absorption of the g-C3N4 nanosheets sensitized by BiOI nanoplates as well as the high charge separation efficiency obtained by the establishment of an internal electric field between the n-type g-C3N4 and p-type BiOI. Based on the characterization and experimental results, a double-transfer mechanism of the photoinduced electrons in the BiOI/g-C3N4 nanosheet composite was proposed to explain its activity. This work represents a new strategy to understand and realize the design and synthesis of g-C3N4 nanosheet-based heterojunctions that display highly efficient charge separation and transfer.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62927-9
       
  • Cobalt nanoparticles encapsulated in nitrogen-doped carbon for
           room-temperature selective hydrogenation of nitroarenes
    • Authors: Ruijie Gao; Lun Pan; Zhengwen Li; Xiangwen Zhang; Li Wang; Ji-Jun Zou
      Pages: 664 - 672
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Ruijie Gao, Lun Pan, Zhengwen Li, Xiangwen Zhang, Li Wang, Ji-Jun Zou
      Here, we report cobalt nanoparticles encapsulated in nitrogen-doped carbon (Co@NC) that exhibit excellent catalytic activity and chemoselectivity for room-temperature hydrogenation of nitroarenes. Co@NC was synthesized by pyrolyzing a mixture of a cobalt salt, an inexpensive organic molecule, and carbon nitride. Using the Co@NC catalyst, a turnover frequency of ∼12.3 h−1 and selectivity for 4-aminophenol of >99.9% were achieved for hydrogenation of 4-nitrophenol at room temperature and 10 bar H2 pressure. The excellent catalytic performance can be attributed to the cooperative effect of hydrogen activation by electron-deficient Co nanoparticles and energetically preferred adsorption of the nitro group of nitroarenes to electron-rich N-doped carbon. In addition, there is electron transfer from the Co nanoparticles to N-doped carbon, which further enhances the functionality of the metal center and carbon support. The catalyst also exhibits stable recycling performance and high activity for nitroaromatics with various substituents.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62988-7
       
  • Promotional effects of Sb on Pd-based catalysts for the direct synthesis
           of hydrogen peroxide at ambient pressure
    • Authors: Doudou Ding; Xingyan Xu; Pengfei Tian; Xianglin Liu; Jing Xu; Yi-Fan Han
      Pages: 673 - 681
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Doudou Ding, Xingyan Xu, Pengfei Tian, Xianglin Liu, Jing Xu, Yi-Fan Han
      TiO2-supported Pd-Sb bimetallic catalysts were prepared and evaluated for the direct synthesis of H2O2 at ambient pressure. The addition of Sb to Pd significantly enhanced catalytic performance, and a Pd50Sb catalyst showed the greatest selectivity of up to 73%. Sb promoted the dispersion of Pd on TiO2, as evidenced by transmission electron microscopy and X-ray diffraction. X-ray photoelectron spectroscopy indicated that the oxidation of Pd was suppressed by Sb. In addition, Sb2O3 layers were formed and partially wrapped the surfaces of Pd catalysts, thus suppressing the activation of H2 and subsequent hydrogenation of H2O2. In situ diffuse reflection infrared Fourier transform spectroscopy for CO adsorption suggested that Sb homogenously located on the surface of Pd-Sb catalysts and isolated contiguous Pd sites, resulting in the rise of the ratio of Pd monomer sites that are favorable for H2O2 formation. As a result, the Sb modified Pd surfaces significantly enhanced the non-dissociative activation of O2 and H2O2 selectivity.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63031-1
       
  • Hydrothermal synthesis of CeO2/NaNbO3 composites with enhanced
           photocatalytic performance
    • Authors: Jin Qian; Yao Xue; Yanhui Ao; Peifang Wang; Chao Wang
      Pages: 682 - 692
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Jin Qian, Yao Xue, Yanhui Ao, Peifang Wang, Chao Wang
      A highly active photocatalyst CeO2/NaNbO3 is fabricated by a simple and facile hydrothermal method. The obtained photocatalyst composites are characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic activity of the obtained samples is demonstrated by the photocatalytic degradation of the colorless antibiotic agent ciprofloxacin and the dye rhodamine B. The results reveal that CeO2/NaNbO3 composites exhibit a higher photocatalytic property than pure NaNbO3 under both UV and visible light irradiation. Furthermore, the optimum mass ratio of CeO2 in the CeO2/NaNbO3 composites is 2.0 wt%. The improved photocatalytic activity is attributed to the higher separation rate of the photo-induced electrons and holes, and the higher migration rate of the photogenerated charge in the interfacial region. Furthermore, the photoluminescence pectra, photocurrent, electrochemical impedance spectroscopy and trapping experiment are applied to demonstrate the photocatalytic reaction mechanism of the as-prepared samples. The result of the trapping experiment indicates that •OH radicals, •O2 − radicals and holes are all involved in the photocatalytic degradation process of RhB. Furthermore, a possible mechanism for the enhancement of the photocatalytic activity is also proposed.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62975-9
       
  • Palladium nanoparticles assembled on titanium nitride for enhanced
           electrochemical hydrodechlorination of 2,4-dichlorophenol in water
    • Authors: Wenyang Fu; Kaifeng Wang; Xiaoshu Lv; Hailu Fu; Xingan Dong; Ling Chen; Xianming Zhang; Guangming Jiang
      Pages: 693 - 700
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Wenyang Fu, Kaifeng Wang, Xiaoshu Lv, Hailu Fu, Xingan Dong, Ling Chen, Xianming Zhang, Guangming Jiang
      We report a one-pot surfactant-free wet-chemical reduction approach to the synthesis of palladium/titanium nitride (Pd/TiN) and Pd/carbon (Pd/C) composites, in which ∼5 nm Pd NPs were uniformly dispersed on TiN or C. In terms of catalytic performance, Pd/TiN showed enhanced efficiency and stability compared with those of Pd/C and bare TiN in the electrocatalytic hydrodechlorination (EHDC) reaction of 2,4-dichlorophenol (2,4-DCP) in aqueous solution. The superior performance of Pd/TiN arises from the promotion effect of TiN. Strong metal-support interactions modified the electronic structure of Pd, which optimized generation of H* ads and 2,4-DCP adsorption/activation. The cathode potential plays a vital role in controlling the EHDC efficiency and the product distribution. A working potential of –0.80 V was shown to be optimal for achieving the highest EHDC efficiency and maximizing conversion of 2,4-DCP to phenol (P). Our studies of the reaction pathway show that EHDC of 2,4-DCP on Pd/TiN proceeded by 2,4-DCP→p-chlorophenol (p-CP), o-chlorophenol (o-CP)→P; however, Pd/TiN presented little selectivity for cleavage of p-C-Cl vs o-C-Cl. This work presents a new approach to enhancing Pd performance towards EHDC through the effects of a support. The strategy demonstrated here could also be extended to design highly efficient catalysts for other hydrogenation reactions.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62937-1
       
  • Enhancement of UV-assisted TiO2 degradation of ibuprofen using Fenton
           hybrid process at circumneutral pH
    • Authors: Meijuan Chen; Wei Chu; Jingzi Beiyuan; Yu Huang
      Pages: 701 - 709
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Meijuan Chen, Wei Chu, Jingzi Beiyuan, Yu Huang
      A synergistic UV/TiO2/Fenton (PCF) process is investigated for the degradation of ibuprofen (IBP) at circumneutral pH. The IBP decay in the PCF process is much faster than that with the conventional UV, UV/H2O2, Fenton, photo-Fenton, and photocatalysis processes. The kinetics analysis showed that the IBP decay follows a two-stage pseudo-first order profile, that is, a fast IBP decay (k 1) followed by a slow decay (k 2). The effects of various parameters, including initial pH level, dosage of Fenton's reagent and TiO2, wavelength of UV irradiation, and initial IBP concentration, are evaluated. The optimum pH level, [Fe2+]0, [Fe2+]0/[H2O2]0 molar ratio, and [TiO2]0 are determined to be approximately 4.22, 0.20 mmol/L, 1/40, and 1.0 g/L, respectively. The IBP decay at circumneutral pH (i.e., 6.0–8.0 for wastewater) shows the same IBP decay efficiency as that at the optimum pH of 4.22 after 30 min, which suggests that the PCF process is applicable for the treatment of wastewater in the circumneutral pH range. The lnk 1 and lnk 2 are observed to be linearly correlated to 1/pH0, [IBP]0, [H2O2]0, [H2O2]0/[Fe2+]0 and ln[TiO2]0. Mathematical models are therefore derived to predict the IBP decay.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63070-0
       
  • The effect of cations (NH4+, Na+, K+, and Ca2+) on chemical deactivation
           of commercial SCR catalyst by bromides
    • Authors: Huazhen Chang; Chuanning Shi; Mingguan Li; Tao Zhang; Chizhong Wang; Lilong Jiang; Xiuyun Wang
      Pages: 710 - 717
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Huazhen Chang, Chuanning Shi, Mingguan Li, Tao Zhang, Chizhong Wang, Lilong Jiang, Xiuyun Wang
      Alkali and alkaline-earth metals from fly ash have a significant deactivation effect on catalysts used for selective catalytic reduction of NO x by NH3 (NH3-SCR). Bromides are considered effective additives to improve Hg0 oxidation on SCR catalysts. In this work, the effects of different bromides (NH4Br, NaBr, KBr, and CaBr2) on a commercial V2O5-WO3/TiO2 catalyst were studied. NO x conversion decreased significantly over the KBr-poisoned catalyst (denoted as L-KBr), while that over NaBr- and CaBr2-poisoned catalysts (denoted as L-NaBr and L-CaBr, respectivity) decreased to a lesser extent compared with the fresh sample. Poor N2 selectivity was observed over L-NaBr, L-KBr and L-CaBr catalysts. The decrease in the ratio of chemisorbed oxygen to total surface oxygen (Oα/(Oα + Oβ + Ow)), reducibility and surface acidity might contribute to the poor activity and N2 selectivity over L-KBr catalyst. The increased Oα ratio was conducive to the enhanced reducibility of L-CaBr. Combined with enhanced surface acidity, this might offset the negative effect of the loss of active sites by CaBr2 covering. The overoxidation of NH3 and poor N2 selectivity in NH3 oxidation should retard the SCR activity at high temperatures over L-CaBr catalyst. The increased basicity might contribute to increased NO x adsorption on L-KBr and L-CaBr catalysts. A correlation between the acid-basic and redox properties of bromide-poisoned catalysts and their catalytic properties is established.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63011-6
       
  • In-situ transformation of Bi2WO6 to highly photoreactive Bi2WO6@Bi2S3
           nanoplate via ion exchange
    • Authors: Tingting Huang; Yuhan Li; Xiaofeng Wu; Kangle Lv; Qin Li; Mei Li; Dongyun Du; Hengpeng Ye
      Pages: 718 - 727
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Tingting Huang, Yuhan Li, Xiaofeng Wu, Kangle Lv, Qin Li, Mei Li, Dongyun Du, Hengpeng Ye
      As a two dimensional (2D) visible-light-responsive semiconductor photocatalyst, the photoreactivity of Bi2WO6 is not high enough for practical application owing to its limited response to visible light and rapid recombination of photogenerated electron-hole pairs. In this paper, 2D core-shell structured Bi2WO6@Bi2S3 nanoplates were prepared by calcination of a mixture of Bi2WO6 (1.3 g) and a certain amount of Na2S·9H2O (0–3.0 g) at 350 °C for 2 h. The reactivity of the resulting photocatalyst materials was evaluated by photocatalytic degradation of Brilliant Red X-3B (X3B), an anionic dye, under visible light irradiation (λ > 420 nm). As the amount of Na2S·9H2O was increased from 0 to 1.5 g, the degradation rate constant of X3B sharply increased from 0.40 × 10−3 to 6.6 × 10−3 min−1. The enhanced photocatalytic activity of Bi2WO6@Bi2S3 was attributed to the photosensitization of Bi2S3, which greatly extended the light-responsive range from the visible to the NIR, and the formation of a heterojunction, which retarded the recombination rate of photogenerated electron-hole pairs. However, further increases in the amount of Na2S·9H2O (from 1.5 to 3.0 g) resulted in a decrease of the photocatalytic activity of the Bi2WO6@Bi2S3 nanoplates owing to the formation of a photo-inactive NaBiS2 layer covering the Bi2WO6 surface.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62913-9
       
  • Supercritical water syntheses of transition metal-doped CeO2
           nano-catalysts for selective catalytic reduction of NO by CO: An in situ
           diffuse reflectance Fourier transform infrared spectroscopy study
    • Authors: Xiaoxia Dai; Weiyu Jiang; Wanglong Wang; Xiaole Weng; Yuan Shang; Yehui Xue; Zhongbiao Wu
      Pages: 728 - 735
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Xiaoxia Dai, Weiyu Jiang, Wanglong Wang, Xiaole Weng, Yuan Shang, Yehui Xue, Zhongbiao Wu
      In the present study, we synthesized CeO2 catalysts doped with various transition metals (M = Co, Fe, or Cu) using a supercritical water hydrothermal route, which led to the incorporation of the metal ions in the CeO2 lattice, forming solid solutions. The catalysts were then used for the selective catalytic reduction (SCR) of NO by CO. The Cu-doped catalyst exhibited the highest SCR activity; it had a T 50 (i.e., 50% NO conversion) of only 83 °C and a T 90 (i.e., 90% NO conversion) of 126 °C. Such an activity was also higher than in many state-of-the-art catalysts. In situ diffuse reflectance Fourier transform infrared spectroscopy suggested that the MO x -CeO2 catalysts (M = Co and Fe) mainly followed an Eley-Rideal reaction mechanism for CO-SCR. In contrast, a Langmuir-Hinshelwood SCR reaction mechanism occurred in CuO-CeO2 owing to the presence of Cu+ species, which ensured effective adsorption of CO. This explains why CuO-CeO2 exhibited the highest activity with regard to the SCR of NO by CO.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)63008-0
       
  • Enhanced visible photocatalytic activity of TiO2 hollow boxes modified by
           methionine for RhB degradation and NO oxidation
    • Authors: Xuan Zhao; Yanting Du; Chengjiang Zhang; Lijun Tian; Xiaofang Li; Kejian Deng; Lianqing Chen; Youyu Duan; Kangle Lv
      Pages: 736 - 746
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Xuan Zhao, Yanting Du, Chengjiang Zhang, Lijun Tian, Xiaofang Li, Kejian Deng, Lianqing Chen, Youyu Duan, Kangle Lv
      Hierarchical TiO2 hollow nanoboxes (TiO2-HNBs) assembled from TiO2 nanosheets (TiO2-NSs) show improved photoreactivity when compared with the building blocks of discrete TiO2-NSs. However, TiO2-HNBs can only be excited by ultraviolet light. In this paper, visible-light-responsive N and S co-doped TiO2-HNBs were prepared by calcining the mixture of cubic TiOF2 and methionine (C5H11NO2S), a N- and S-containing biomacromolecule. The effect of calcination temperature on the structure and performance of the TiO2-HNBs was systematically studied. It was found that methionine can prevent TiOF2-to-anatase TiO2 phase transformation. Both N and S elements are doped into the lattice of TiO2-HNBs when the mixture of TiOF2 and methionine undergoes calcination at 400 °C, which is responsible for the visible-light response. When compared with that of pure 400 °C-calcined TiO2-HNBs (T400), the photoreactivity of 400 °C-calcined methionine-modified TiO2-HNBs (TM400) improves 1.53 times in photocatalytic degradation of rhodamine-B dye under visible irradiation (λ > 420 nm). The enhanced visible photoreactivity of methionine-modified TiO2-HNBs is also confirmed by photocatalytic oxidation of NO. The successful doping of N and S elements into the lattice of TiO2-HNBs, resulting in the improved light-harvesting ability and efficient separation of photo-generated electron-hole pairs, is responsible for the enhanced visible photocatalytic activity of methionine-modified TiO2-HNBs. The photoreactivity of methionine modified TiO2-HNBs remains nearly unchanged even after being recycled five times, indicating its promising use in practical applications.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63039-6
       
  • Facile synthesis of C-decorated Fe, N co-doped TiO2 with enhanced
           visible-light photocatalytic activity by a novel co-precursor method
    • Authors: Hualin Jiang; Jun Liu; Menglin Li; Lei Tian; Gongsheng Ding; Pinghua Chen; Xubiao Luo
      Pages: 747 - 759
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Hualin Jiang, Jun Liu, Menglin Li, Lei Tian, Gongsheng Ding, Pinghua Chen, Xubiao Luo
      Lattice-doping and surface decoration are prospective routes to improve the visible-light photocatalytic ability of TiO2, but the two techniques are difficult to combine into one preparation process because they are usually conducted under different conditions, which limits the efficiency of TiO2 modification. In this study, TiO2 was successfully modified by simultaneous lattice-doping and surface decoration, and the visible-light photocatalytic capacity was largely improved. Upon comparing the method reported here with previous ones, the most significant difference is that Fe(II)-phenanthroline was first used as the co-precursor of the introduced elements of C, N, and Fe. These three elements were simultaneously introduced to TiO2 at high levels by this co-precursor method. The as-synthesized photocatalysts were systemically investigated and analyzed by several characterization methods such as XRD, FT-IR, XPS, Raman spectroscopy, EPR, UV-Vis DRS, photoluminescence spectra, photocurrent, electrochemical impedance spectra, TEM, and HRTEM. The photocatalytic degradation of 4-NP under visible-light irradiation was used to evaluate the photocatalytic activity of the photocatalysts. Based on the experimental data, a probable mechanism for the photocatalytic degradation by the photocatalysts is proposed. This is a novel method of using one source to simultaneously introduce metal and non-metal elements to TiO2 at high levels, which may provide a new way to prepare highly effective TiO2 photocatalysts.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63038-4
       
  • Gold/monolayer graphitic carbon nitride plasmonic photocatalyst for
           ultrafast electron transfer in solar-to-hydrogen energy conversion
    • Authors: Zhao Mo; Hui Xu; Zhigang Chen; Xiaojie She; Yanhua Song; Pengcheng Yan; Yuanguo Xu; Yucheng Lei; Shouqi Yuan; Huaming Li
      Pages: 760 - 770
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Zhao Mo, Hui Xu, Zhigang Chen, Xiaojie She, Yanhua Song, Pengcheng Yan, Yuanguo Xu, Yucheng Lei, Shouqi Yuan, Huaming Li
      Gold (Au) plasmonic nanoparticles were grown evenly on monolayer graphitic carbon nitride (g-C3N4) nanosheets via a facile oil-bath method. The photocatalytic activity of the Au/monolayer g-C3N4 composites under visible light was evaluated by photocatalytic hydrogen evolution and environmental treatment. All of the Au/monolayer g-C3N4 composites showed better photocatalytic performance than that of monolayer g-C3N4 and the 1% Au/monolayer g-C3N4 composite displayed the highest photocatalytic hydrogen evolution rate of the samples. The remarkable photocatalytic activity was attributed largely to the successful introduction of Au plasmonic nanoparticles, which led to the surface plasmon resonance (SPR) effect. The SPR effect enhanced the efficiency of light harvesting and induced an efficient hot electron transfer process. The hot electrons were injected from the Au plasmonic nanoparticles into the conduction band of monolayer g-C3N4. Thus, the Au/monolayer g-C3N4 composites possessed higher migration and separation efficiencies and lower recombination probability of photogenerated electron-hole pairs than those of monolayer g-C3N4. A photocatalytic mechanism for the composites was also proposed.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62978-4
       
  • One-step synthesized SO42–-TiO2 with exposed (001) facets and its
           application in selective catalytic reduction of NO by NH3
    • Authors: Yexuan Wen; Shuang Cao; Xiaoqi Fei; Haiqiang Wang; Zhongbiao Wu
      Pages: 771 - 778
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Yexuan Wen, Shuang Cao, Xiaoqi Fei, Haiqiang Wang, Zhongbiao Wu
      A sample of sulfated anatase TiO2 with high-energy (001) facets (TiO2-001) was prepared by a simple one-step hydrothermal route using SO4 2– as a morphology-controlling agent. After doping ceria, Ce/TiO2-001 was used as the catalyst for selective catalytic reduction (SCR) of NO with NH3. Compared with Ce/P25 (Degussa P25 TiO2) and Ce/P25-S (sulfated P25) catalysts, Ce/TiO2-001 was more suitable for medium- and high-temperature SCR of NO due to the high surface area, sulfation, and the excellent properties of the active-energy (001) facets. All of these facilitated the generation of abundant acidity, chemisorbed oxygen, and activated NO x -adsorption species, which were the important factors for the SCR reaction.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63034-7
       
  • Improving visible-light-driven photocatalytic NO oxidation over BiOBr
           nanoplates through tunable oxygen vacancies
    • Authors: Jiazhen Liao; Lvcun Chen; Minglu Sun; Ben Lei; Xiaolan Zeng; Yanjuan Sun; Fan Dong
      Pages: 779 - 789
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Jiazhen Liao, Lvcun Chen, Minglu Sun, Ben Lei, Xiaolan Zeng, Yanjuan Sun, Fan Dong
      In this work, a series of BiOBr nanoplates with oxygen vacancies (OVs) were synthesized by a solvothermal method using a water/ethylene glycol solution. The number of OVs and facets of BiOBr were tuned by changing the water/ethylene glycol ratio. Although the role of OVs in photocatalysis has been investigated, the underlying mechanisms of charge transfer and reactant activation remain unknown. To unravel the effect of OVs on the reactant activation and photocatalytic NO oxidation process, in situ diffuse reflectance infrared Fourier transform spectroscopy, so-called DRIFTS, and theoretical calculations were performed and their results combined. The photocatalytic efficiency of the as-prepared BiOBr was significantly increased by increasing the amount of OVs. The oxygen vacancies had several effects on the photocatalysts, including the introduction of intermediate energy levels that enhanced light absorption, promoted electron transfer, acted as active sites for catalytic reaction and the activation of oxygen molecules, and facilitated the conversion of the intermediate products to the final product, thus increasing the overall visible light photocatalysis efficiency. The present work provides new insights into the understanding of the role of OVs in photocatalysts and the mechanism of photocatalytic NO oxidation.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63056-6
       
  • Paper-derived cobalt and nitrogen co-doped carbon nanotube@porous carbon
           as a nonprecious metal electrocatalyst for the oxygen reduction reaction
    • Authors: Gaopeng Liu; Bin Wang; Li Xu; Penghui Ding; Pengfei Zhang; Jiexiang Xia; Huaming Li; Junchao Qian
      Pages: 790 - 799
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Gaopeng Liu, Bin Wang, Li Xu, Penghui Ding, Pengfei Zhang, Jiexiang Xia, Huaming Li, Junchao Qian
      The oxygen reduction reaction (ORR) is a vitally important process in fuel cells. The development of high-performance and low-cost ORR electrocatalysts with outstanding stability is essential for the commercialization of the electrochemical energy technology. Herein, we report a facile synthesis of cobalt (Co) and nitrogen (N) co-doped carbon nanotube@porous carbon (Co/N/CNT@PC-800) electrocatalyst through a one-step pyrolysis of waste paper, dicyandiamide, and cobalt(II) acetylacetonate. The surface of the hierarchical porous carbon supported a large number of carbon nanotubes (CNTs), which were derived from dicyandiamide through the catalysis of Co. The addition of Co resulted in the formation of a hierarchical micro/mesoporous structure, which was beneficial for the exposure of active sites and rapid transportation of ORR-relevant species (O2, H+, OH−, and H2O). The doped N and Co formed more active sites to enhance the ORR activity of the electrocatalyst. The Co/N/CNT@PC-800 material exhibited optimal ORR performance with an onset potential of 0.005 V vs. Ag/AgCl and a half-wave potential of –0.173 V vs. Ag/AgCl. Meanwhile, the electrocatalyst showed an excellent methanol tolerance and a long-term operational durability than that of Pt/C, as well as a quasi-four-electron reaction pathway. The low-cost and simple synthesis approach makes the Co/N/CNT@PC-800 a prospective electrocatalyst for the ORR. Furthermore, this work provides an alternative approach for exploring the use of biomass-derived electrocatalysts for renewable energy applications.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62982-6
       
  • Stability of Cu–Mn bimetal catalysts based on different zeolites for NOx
           removal from diesel engine exhaust
    • Authors: Shuang Zhao; Liming Huang; Boqiong Jiang; Min Cheng; Jiawei Zhang; Yijing Hu
      Pages: 800 - 809
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Shuang Zhao, Liming Huang, Boqiong Jiang, Min Cheng, Jiawei Zhang, Yijing Hu
      Cu–Mn bimetal catalysts were prepared to remove nitrogen oxides (NO x ) from diesel engine exhaust at low temperatures. At a Cu/Mn ratio of 3:2, the NO x conversions at 200 °C reached 65% and 90% on Cu–Mn/ZSM-5 and Cu–Mn/SAPO-34, respectively. After a hydrothermal treatment and reaction in the presence of C3H6, the activity of Cu–Mn/SAPO-34 was more stable than that of Cu–Mn/ZSM-5. No obvious variations in the crystal structure or dealumination were observed, whereas the physical structure was best maintained in Cu–Mn/SAPO-34. The atomic concentration of Cu on the surface of Cu–Mn/SAPO-34 was quite stable, and the consumption of octahedrally coordinated Cu2+ could be recovered. Conversely, the proportion of octahedrally coordinated Cu2+ on the surface of Cu–Mn/ZSM-5 significantly decreased. Therefore, besides the structure, the redox cycle between Cu+ and octahedrally coordinated Cu2+ played an important role in the stability of the catalysts.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63013-x
       
  • Flower-like Bi2WO6/ZnO composite with excellent photocatalytic capability
           under visible light irradiation
    • Authors: Juan Cheng; Yi Shen; Kuan Chen; Xi Wang; Yongfu Guo; Xiaoji Zhou; Renbi Bai
      Pages: 810 - 820
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Juan Cheng, Yi Shen, Kuan Chen, Xi Wang, Yongfu Guo, Xiaoji Zhou, Renbi Bai
      The photocatalytic ability of ZnO is improved through the addition of flower-like Bi2WO6 to prepare a Bi2WO6/ZnO composite with visible light activity. The composite is characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy with UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy and N2 adsorption-desorption isotherms. After modification, the band gap energy of Bi2WO6/ZnO is reduced from 3.2 eV for ZnO to 2.6 eV. Under visible light irradiation, the Bi2WO6/ZnO composite shows an excellent photocatalytic activity for degrading methylene blue (MB) and tetracycline. The photo-degradation efficiencies of (0.3:1) Bi2WO6/ZnO for MB and tetracycline are approximately 246 and 4500 times higher than those of bare ZnO, respectively, and correspondingly, the photo-degradation rates for the two pollutants are approximately 120 and 200 times higher than those with bare ZnO, respectively. Moreover, the photocatalyst of (0.3:1) Bi2WO6/ZnO exhibits a higher transient photocurrent density of approximately 4.5 μA compared with those of bare Bi2WO6 and ZnO nanoparticles. The successful recombination of Bi2WO6 and ZnO enhances the photocatalytic activity and reduces the band gap energy of ZnO, which can be attributed to the effective separation of electron–hole pairs. Active species trapping experiments display that [O2]− is the major species involved during photocatalysis rather than •OH and h+. This study provides insight into designing a meaningful visible-light-driven photocatalyst for environmental remediation.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)63004-3
       
  • Synthesis of novel MnOx@TiO2 core-shell nanorod catalyst for
           low-temperature NH3-selective catalytic reduction of NOx with enhanced SO2
           tolerance
    • Authors: Zhongyi Sheng; Dingren Ma; Danqing Yu; Xiang Xiao; Bingjie Huang; Liu Yang; Sheng Wang
      Pages: 821 - 830
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Zhongyi Sheng, Dingren Ma, Danqing Yu, Xiang Xiao, Bingjie Huang, Liu Yang, Sheng Wang
      In this study, a MnO x @TiO2 core-shell catalyst prepared by a two-step method was used for the low-temperature selective catalytic reduction of NO x with NH3. The catalyst exhibits high activity, high stability, and excellent N2 selectivity. Furthermore, it displays better SO2 and H2O tolerance than its MnO x , TiO2, and MnO x /TiO2 counterparts. The prepared catalyst was characterized systematically by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorption and H2 temperature-programmed reduction analyses. The optimized MnO x @TiO2 catalyst exhibits an obvious core-shell structure, where the TiO2 shell is evenly distributed over the MnO x nanorod core. The catalyst also presents abundant mesopores, Lewis-acid sites, and high redox capability, all of which enhance its catalytic performance. According to the XPS results, the decrease in the number of Mn4+ active centers after SO2 poisoning is significantly lower in MnO x @TiO2 than in MnO x /TiO2. The core-shell structure is hence able to protect the catalytic active sites from H2O and SO2 poisoning.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63059-1
       
  • In-situ polymerization for PPy/g-C3N4 composites with enhanced visible
           light photocatalytic performance
    • Authors: Hongju Han; Min Fu; Yalin Li; Wei Guan; Peng Lu; Xueli Hu
      Pages: 831 - 840
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Hongju Han, Min Fu, Yalin Li, Wei Guan, Peng Lu, Xueli Hu
      Polypyrrole-modified graphitic carbon nitride composites (PPy/g-C3N4) are fabricated using an in-situ polymerization method to improve the visible light photocatalytic activity of g-C3N4. The PPy/g-C3N4 is applied to the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Various characterization techniques are employed to investigate the relationship between the structural properties and photoactivities of the as-prepared composites. Results show that the specific surface area of the PPy/g-C3N4 composites increases upon assembly of the amorphous PPy nanoparticles on the g-C3N4 surface. Owing to the strong conductivity, the PPy can be used as a transition channel for electrons to move onto the g-C3N4 surface, thus inhibiting the recombination of photogenerated carriers of g-C3N4 and improving the photocatalytic performance. The elevated light adsorption of PPy/g-C3N4 composites is attributed to the strong absorption coefficient of PPy. The composite containing 0.75 wt% PPy exhibits a photocatalytic efficiency that is 3 times higher than that of g-C3N4 in 2 h. Moreover, the degradation kinetics follow a pseudo-first-order model. A detailed photocatalytic mechanism is proposed with ·OH and ·O2 − radicals as the main reactive species. The present work provides new insights into the mechanistic understanding of PPy in PPy/g-C3N4 composites for environmental applications.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62997-8
       
  • Enhanced visible-light-driven photocatalytic activities of 0D/1D
           heterojunction carbon quantum dot modified CdS nanowires
    • Authors: Zhiwei Chen; Chang Feng; Weibing Li; Zhiyong Sun; Jian Hou; Xiangbo Li; Likun Xu; Mingxian Sun; Yuyu Bu
      Pages: 841 - 848
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Zhiwei Chen, Chang Feng, Weibing Li, Zhiyong Sun, Jian Hou, Xiangbo Li, Likun Xu, Mingxian Sun, Yuyu Bu
      Zero-dimensional carbon dots (0D C-dots) and one-dimensional sulfide cadmium nanowires (1D CdS NWs) were prepared by microwave and solvothermal methods, respectively. A series of heterogeneous photocatalysts that consisted of 1D CdS NWs that were modified with 0D C-dots (C-dots/CdS NWs) were synthesized using chemical deposition methods. The mass fraction of C-dots to CdS NWs in these photocatalysts was varied. The photocatalysts were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. Their photocatalytic performance for the spitting of water and the degradation of rhodamine B (RhB) under visible light irradiation were investigated. The photocatalytic performance of the C-dots/CdS NWs was enhanced when compared with that of the pure CdS NWs, with the 0.4% C-dots/CdS NWs exhibiting the highest photocatalytic activity for the splitting of water and the degradation of RhB. The enhanced photocatalytic activity was attributed to a higher carrier density because of the heterojunction between the C-dots and CdS NWs. This heterojunction improved the electronic transmission capacity and promoted efficient separation of photogenerated electrons and holes.
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      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62972-3
       
  • Preparation of MnCo/MCM-41 catalysts with high performance for
           chlorobenzene combustion
    • Authors: Zhen Cheng; Jingrong Li; Peng Yang; Shufeng Zuo
      Pages: 849 - 856
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Zhen Cheng, Jingrong Li, Peng Yang, Shufeng Zuo
      MCM-41 was synthesized by a soft template technique. The specific surface area and pore volume of the MCM-41 were 805.9 m2/g and 0.795 cm3/g, respectively. MCM-41-supported manganese and cobalt oxide catalysts were prepared by an impregnation method. The energy dispersive X-ray spectroscopy clearly confirmed the existence of Mn, Co, and O, which indicated the successful loading of the active components on the surface of MCM-41. The structure and function of the catalysts were changed by modulating the molar ratio of manganese to cobalt. The 10%MnCo(6:1)/MCM-41 (Mn/Co molar ratio is 6:1) catalyst displayed the best catalytic activity according to the activity evaluation experiments, and chlorobenzene (1000 ppm) was totally decomposed at 270 °C. The high activity correlated with a high dispersion of the oxides and was attributed to the exposure of more active sites, which was demonstrated by X-ray diffraction and high-resolution transmission electron microscopy. The strong interactions between MnO2, Co3O4, MnCoOx, and MCM-41 indicated that cobalt promoted the redox cycles of the manganese system. The bimetal-oxide-based catalyst showed better catalytic activity than that of the single metal oxide catalysts, which was further confirmed by H2 temperature-programmed reduction. Chlorobenzene temperature-programmed desorption results showed that 10%MnCo(6:1)/MCM-41 had higher adsorption strength for chlorobenzene than that of single metal catalysts. And stronger adsorption was beneficial for combustion of chlorobenzene. Furthermore, 10%MnCo(6:1)/MCM-41 was not deactivated during a continuous reaction for 1000 h at 260 °C and displayed good resistance to water and benzene, which indicated that the catalyst could be used in a wide range of applications.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62950-4
       
  • The relationship between the microstructures and catalytic behaviors of
           iron–oxygen precursors during direct coal liquefaction
    • Authors: Jing Xie; Hanfeng Lu; Geping Shu; Kejian Li; Xuwen Zhang; Hongxue Wang; Wang Yue; Shansong Gao; Yinfei Chen
      Pages: 857 - 866
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Jing Xie, Hanfeng Lu, Geping Shu, Kejian Li, Xuwen Zhang, Hongxue Wang, Wang Yue, Shansong Gao, Yinfei Chen
      A series of both unsupported and coal-supported iron–oxygen compounds with gradual changes in microstructure were synthesized by a precipitation-oxidation process at 20 to 70 °C. The relationship between the microstructures and catalytic activities of these precursors during direct coal liquefaction was studied. The results show that the microstructure could be controlled through adjusting the synthesis temperature during the precipitation-oxidation procedure, and that compounds synthesized at lower temperatures exhibit higher catalytic activity. As a result of their higher proportions of γ-FeOOH or α-FeOOH crystalline phases, the unsupported iron–oxygen compounds synthesized at 20–30 °C, which also had high specific surface areas and moisture levels, generate oil yields 4.5%–4.6% higher than those obtained with precursors synthesized at 70 °C. It was also determined that higher oil yields were obtained when the catalytically-active phase formed by the precursors during liquefaction (pyrrhotite, Fe1−x S) had smaller crystallites. Feed coal added as a carrier was found to efficiently disperse the active precursors, which in turn significantly improved the catalytic activity during coal liquefaction.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62919-x
       
  • Photocatalytic performance of TiO2 nanocrystals with/without oxygen
           defects
    • Authors: Kezhen Qi; Shu-yuan Liu; Meng Qiu
      Pages: 867 - 875
      Abstract: Publication date: April 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 4
      Author(s): Kezhen Qi, Shu-yuan Liu, Meng Qiu
      To investigate the role of oxygen defects on the photocatalytic activity of TiO2, the TiO2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol-gel methods, respectively. The as-prepared TiO2 nanocrystals with defects are light blue and the absorption edge of light is towards the visible light region (∼420 nm). Raman and X-ray photoelectron spectroscopy (XPS) measurements all confirm that the concentration of oxygen vacancies in the TiO2 synthesized by the sol-gel method is less than that synthesized through the hydrothermal route. The introduction of oxygen defects contributes to a new state in the band gap that narrows the band gap, which is the reason for the extension of light absorption into the visible light region. The photocurrent results confirm that this band-gap narrowing enhances the photocurrent response under simulated solar light irradiation. The TiO2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO2 sample. The photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62999-1
       
  • Preface to the Special Issue of Photocatalysis for Solar Fuels
    • Authors: Hongxian Han; Gang Liu
      Pages: 367 - 368
      Abstract: Publication date: March 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 3
      Author(s): Hongxian Han, Gang Liu
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(18)63041-4
       
  • Progress in designing effective photoelectrodes for solar water splitting
    • Authors: Zhiliang Wang; Lianzhou Wang
      Pages: 369 - 378
      Abstract: Publication date: March 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 3
      Author(s): Zhiliang Wang, Lianzhou Wang
      Photoelectrochemical (PEC) water splitting process is regarded as a promising route to generate hydrogen by solar energy and at the heart of PEC is efficient electrode design. Great progress has been achieved in the aspects of material design, cocatalyst study, and electrode fabrication over the past decades. However, some key challenges remain unsolved, including the most demanded conversion efficiency issue. As three critical steps, i.e. light harvesting, charge transfer and surface reaction of the PEC process, occur in a huge range of time scale (from 10−12 s to 100 s), how to manage these subsequent steps to facilitate the seamless cooperation between each step to realize efficient PEC process is essentially important. This review focuses on an integral consideration of the three key criteria based on the recent progress on high efficient and stable photoelectrode design in PEC. The basic principles and potential strategies are summarized. Moreover, the challenge and perspective are also discussed.
      Graphical abstract image

      PubDate: 2018-04-25T00:51:57Z
      DOI: 10.1016/s1872-2067(17)62998-x
       
 
 
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